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Influence of Bubble-point Pressure on the Gas Formation in an Oil Reservoir Under Water Injection

机译：泡沫点压对水注射室油藏气体形成的影响

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To evaluate the oil recovering in a reservoir producing at the bubble-point pressure, we performed numerical simulations using a sandbox model and a black oil approach for the reservoir, and the tool-kit CFD software OpenFOAM. A new solver treats the three-phase dynamics of the oil-water-gas in the reservoir. The calculation includes four cases with different pressures of the injection and production wells to explore the free gas formation. Our results show that even keeping constant the pressure unbalance between the injection and production wells, we observe different dynamics. There is no gas formation and a typical production profile results if the bottom-hole pressure is just above the bubble-point in the injection and production wells. In case only the production well bottom-hole pressure is just below the bubble-point, we see no gas formation near the injection well and oscillatory gas formation around the production well. We see a triphasic flow along with the whole domain if both bottom-hole pressures are just below the bubble-point. However, if the bottom-hole pressure in both wells goes further below, the gas flow rate no more oscillates and the gas formation becomes continuous. We have also treated a special case to analyze the influence of gravity on the triphasic flow. Here we observed the gravity segregation to be not significant.
机译：为了评估在泡沫点压力下产生的储层中恢复的油，我们使用沙箱模型进行数值模拟和储存器的黑色石油方法，以及工具包CFD软件OpenFoam。新的求解器对储层中的油 - 水气体进行三相动态。该计算包括四个患者，具有注射和生产井的不同压力，以探索自由气体形成。我们的研究结果表明，即使保持恒定的注射和生产井之间的压力不平衡，我们观察不同的动态。如果底部孔压力沿着注射和生产井的气泡点高于泡点，则没有气体形成和典型的生产型材。如果只有生产良好的底部孔压力位于气泡点以下，我们认为在注射孔附近没有气体形成，并且在生产井周围振荡气体形成。如果底部孔压力均匀低于气泡点，我们会看到三班车流量随着整个领域。然而，如果两个孔中的底部孔压力进一步下面，则气体流速不再振荡，并且气体形成变得连续。我们还对特殊的情况进行了处理，分析重力对三足球流动的影响。在这里，我们观察到重力分离并不重要。

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